Pneumatic tire



c. PARlD Y PNEUMATIC TIRE Juiy 7, 1931.

Filed July 3, 1929 Patented July 7, 1931 I i F} UNITED- STATES PATENT OFFICE CHARLES PABIDY, OF IBELLE'VILLE, ILLINOIS PNEUMATIC TIRE Application filed July 3, 1929. Serial No. 375,637.

My inyention relates to improvements in is made more resilient. The openings can neumatlc tires, and has for its primary be placed as close together as desired; it folob ect the construction of a casing for pneulowing that the more openings in the tread, matic tires which is provided with a relathe more resilient the tread will be.

I tively heavy tread extending completely My purpose in making the openings taper 55 around the casing whereby the danger of or frusto-conical is that in the event dirt puncturing the casing and tube to be conaccumulates in these openings as when ridtained therein by tacks and other small ing over a? muddy road, the openings will nails, such as are commonly found on roadconstantly be flattened as that portion of the 1 ways, is reduced to a minimum. tread contacts with the road surface. This 60 7 further object is to construct a pneuwill naturally compress the mud which has matic tire in which the casing is provided gathered in the openings, and upon that with a heavy upstanding tread, the tread portion of the tread leaving the road surfaoe having spaced apart transverse openings and due to the conical shape of the openings, therein, the openings being so shaped as the dirt will readily pass out of these open- 65 to be self cleaning so that dirt and mud will ings. not be retained therein as this would de- This is also enhanced by the centrifugal stroy the resiliency of the tread. action of the rotating tire because the tend- In the drawings: ency will be to throw the dirt toward the Fig. l is a side elevation of a vehicle outside or periphery of the tread and this 7 wheel with my improved tire in position; dirt coming in contact with the upwardly and and outwardly inclined wall of the opening Fig. 2 is an enlarged fragmental perspecwill have a tendency to slide along this wall tive section of the casing. and be'thrown out from the tire. If it were In the construction of my device I employ not for this fact, there would be danger T a casing 3, this being preferably in the form of the mud remaining in the openings an of an endless tube, which is open at its botbecome densely packed therein and in a tom, so that an air tube can be inserted short time destroy all resiliency which has therein. been imparted to the tread by reason of the Extending around the eripher of the openings, but With my improved method 80 casing 3 is a flange or tread 4. This tread of forming the openings conical with the is formed as an integral part of the casing large end of the opening at the outside walls and is of vulcanized rubber. The casing 3 of the tread, such retention of mud and is built in a manner well known to the neuother foreign matter in the openings is prematic tire trade and, therefore, nee s no V nted I particular description. It will also be noted that the web 7 is The periphery of the extension or tread 4 relatively thin so that it can vibrate or move, is preferably roughened as illustrated by the tha is bulge from one side to the other. numeral 5 so that it will have a greater grip- This vibration or bulging of the web as it ping efi'ect on the road surface. I do not, passes under the load point will have a tend- 90 however, desire to limit myself to any preency to start or push out any dirt or forei cise form of roughening as this may be made matter which lodges against the web or t e of any desired design. base of the openings 6 thereby assisting the In the side walls of the tread member 4 cleaning of these openings and keeping them are formed openings 6. These openings exfree from accumulations of foreign matter. 95 tend transversely of the tread and are sub- Havin fully described my invention, stantially frusto-conical, leaving a relatively what lc aim is: thin web of rubber 7 between the openings 1. A tire comprising a pneumatic casing on opposite sides of the tread. By this portion and an integral tread portion of construction it will be noted that the tread relatively greater diameter and relatively 100 narrow Width, said tread portion having relatively thin circumferentially spaced diaphragnis at the medial portion of the tread formed by nlined frusto-conical shaped re- 5 cesses extending inwardly from the opposite sides of the tread, said recesses being substantially tangential to the casing portion thereat.

2. A tire comprising a casin substan- 1o tially circular in cross section and provided with an integral tread portion of relatively narrow Width and greater diameter than said casing, said tread portion having alined circumferentially spaced frusto-conical shaped recesses at the sides thereof and tangential to said casing forming relatively thin diaphragms at the medial portion of the tread.

In testimony whereof I have afiixed my signature.

CHARLES PARIDY. 

